22121802756 has 45 divisors (see below), whose sum is σ = 57837761751. Its totient is φ = 7373041848.

The previous prime is 22121802751. The next prime is 22121802763. The reversal of 22121802756 is 65720812122.

It is a happy number.

The square root of 22121802756 is 148734.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 22121802756.

It is not an unprimeable number, because it can be changed into a prime (22121802751) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2673081 + ... + 2681343.

Almost surely, 2^22121802756 is an apocalyptic number.

22121802756 is the 148734-th square number.

It is an amenable number.

22121802756 is an abundant number, since it is smaller than the sum of its proper divisors (35715958995).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22121802756 is an frugal number, since it uses more digits than its factorization.

22121802756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16542 (or 8268 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

Multiplying 22121802756 by its sum of digits (36), we get a square (796384899216 = 892404²).

22121802756 divided by its sum of digits (36) gives a square (614494521 = 24789²).

The spelling of 22121802756 in words is "twenty-two billion, one hundred twenty-one million, eight hundred two thousand, seven hundred fifty-six".